// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

// Glue code between CodeMirror and Tern.
//
// Create a CodeMirror.TernServer to wrap an actual Tern server,
// register open documents (CodeMirror.Doc instances) with it, and
// call its methods to activate the assisting functions that Tern
// provides.
//
// Options supported (all optional):
// * defs: An array of JSON definition data structures.
// * plugins: An object mapping plugin names to configuration
//   options.
// * getFile: A function(name, c) that can be used to access files in
//   the project that haven't been loaded yet. Simply do c(null) to
//   indicate that a file is not available.
// * fileFilter: A function(value, docName, doc) that will be applied
//   to documents before passing them on to Tern.
// * switchToDoc: A function(name, doc) that should, when providing a
//   multi-file view, switch the view or focus to the named file.
// * showError: A function(editor, message) that can be used to
//   override the way errors are displayed.
// * completionTip: Customize the content in tooltips for completions.
//   Is passed a single argument—the completion's data as returned by
//   Tern—and may return a string, DOM node, or null to indicate that
//   no tip should be shown. By default the docstring is shown.
// * typeTip: Like completionTip, but for the tooltips shown for type
//   queries.
// * responseFilter: A function(doc, query, request, error, data) that
//   will be applied to the Tern responses before treating them
//
//
// It is possible to run the Tern server in a web worker by specifying
// these additional options:
// * useWorker: Set to true to enable web worker mode. You'll probably
//   want to feature detect the actual value you use here, for example
//   !!window.Worker.
// * workerScript: The main script of the worker. Point this to
//   wherever you are hosting worker.js from this directory.
// * workerDeps: An array of paths pointing (relative to workerScript)
//   to the Acorn and Tern libraries and any Tern plugins you want to
//   load. Or, if you minified those into a single script and included
//   them in the workerScript, simply leave this undefined.

(function(mod) {
  if (typeof exports == 'object' && typeof module == 'object')
    // CommonJS
    mod(require('../../lib/codemirror'));
  else if (typeof define == 'function' && define.amd)
    // AMD
    define(['../../lib/codemirror'], mod);
  // Plain browser env
  else mod(CodeMirror);
})(function(CodeMirror) {
  'use strict';
  // declare global: tern

  CodeMirror.TernServer = function(options) {
    var self = this;
    this.options = options || {};
    var plugins = this.options.plugins || (this.options.plugins = {});
    if (!plugins.doc_comment) plugins.doc_comment = true;
    this.docs = Object.create(null);
    if (this.options.useWorker) {
      this.server = new WorkerServer(this);
    } else {
      this.server = new tern.Server({
        getFile: function(name, c) {
          return getFile(self, name, c);
        },
        async: true,
        defs: this.options.defs || [],
        plugins: plugins,
      });
    }
    this.trackChange = function(doc, change) {
      trackChange(self, doc, change);
    };

    this.cachedArgHints = null;
    this.activeArgHints = null;
    this.jumpStack = [];

    this.getHint = function(cm, c) {
      return hint(self, cm, c);
    };
    this.getHint.async = true;
  };

  CodeMirror.TernServer.prototype = {
    addDoc: function(name, doc) {
      var data = { doc: doc, name: name, changed: null };
      this.server.addFile(name, docValue(this, data));
      CodeMirror.on(doc, 'change', this.trackChange);
      return (this.docs[name] = data);
    },

    delDoc: function(id) {
      var found = resolveDoc(this, id);
      if (!found) return;
      CodeMirror.off(found.doc, 'change', this.trackChange);
      delete this.docs[found.name];
      this.server.delFile(found.name);
    },

    hideDoc: function(id) {
      closeArgHints(this);
      var found = resolveDoc(this, id);
      if (found && found.changed) sendDoc(this, found);
    },

    complete: function(cm) {
      cm.showHint({ hint: this.getHint });
    },

    showType: function(cm, pos, c) {
      showContextInfo(this, cm, pos, 'type', c);
    },

    showDocs: function(cm, pos, c) {
      showContextInfo(this, cm, pos, 'documentation', c);
    },

    updateArgHints: function(cm) {
      updateArgHints(this, cm);
    },

    jumpToDef: function(cm) {
      jumpToDef(this, cm);
    },

    jumpBack: function(cm) {
      jumpBack(this, cm);
    },

    rename: function(cm) {
      rename(this, cm);
    },

    selectName: function(cm) {
      selectName(this, cm);
    },

    request: function(cm, query, c, pos) {
      var self = this;
      var doc = findDoc(this, cm.getDoc());
      var request = buildRequest(this, doc, query, pos);
      var extraOptions =
        request.query &&
        this.options.queryOptions &&
        this.options.queryOptions[request.query.type];
      if (extraOptions)
        for (var prop in extraOptions) request.query[prop] = extraOptions[prop];

      this.server.request(request, function(error, data) {
        if (!error && self.options.responseFilter)
          data = self.options.responseFilter(doc, query, request, error, data);
        c(error, data);
      });
    },

    destroy: function() {
      closeArgHints(this);
      if (this.worker) {
        this.worker.terminate();
        this.worker = null;
      }
    },
  };

  var Pos = CodeMirror.Pos;
  var cls = 'CodeMirror-Tern-';
  var bigDoc = 250;

  function getFile(ts, name, c) {
    var buf = ts.docs[name];
    if (buf) c(docValue(ts, buf));
    else if (ts.options.getFile) ts.options.getFile(name, c);
    else c(null);
  }

  function findDoc(ts, doc, name) {
    for (var n in ts.docs) {
      var cur = ts.docs[n];
      if (cur.doc == doc) return cur;
    }
    if (!name)
      for (var i = 0; ; ++i) {
        n = '[doc' + (i || '') + ']';
        if (!ts.docs[n]) {
          name = n;
          break;
        }
      }
    return ts.addDoc(name, doc);
  }

  function resolveDoc(ts, id) {
    if (typeof id == 'string') return ts.docs[id];
    if (id instanceof CodeMirror) id = id.getDoc();
    if (id instanceof CodeMirror.Doc) return findDoc(ts, id);
  }

  function trackChange(ts, doc, change) {
    var data = findDoc(ts, doc);

    var argHints = ts.cachedArgHints;
    if (
      argHints &&
      argHints.doc == doc &&
      cmpPos(argHints.start, change.to) >= 0
    )
      ts.cachedArgHints = null;

    var changed = data.changed;
    if (changed == null)
      data.changed = changed = { from: change.from.line, to: change.from.line };
    var end = change.from.line + (change.text.length - 1);
    if (change.from.line < changed.to)
      changed.to = changed.to - (change.to.line - end);
    if (end >= changed.to) changed.to = end + 1;
    if (changed.from > change.from.line) changed.from = change.from.line;

    if (doc.lineCount() > bigDoc && change.to - changed.from > 100)
      setTimeout(function() {
        if (data.changed && data.changed.to - data.changed.from > 100)
          sendDoc(ts, data);
      }, 200);
  }

  function sendDoc(ts, doc) {
    ts.server.request(
      { files: [{ type: 'full', name: doc.name, text: docValue(ts, doc) }] },
      function(error) {
        if (error) window.console.error(error);
        else doc.changed = null;
      },
    );
  }

  // Completion

  function hint(ts, cm, c) {
    ts.request(
      cm,
      { type: 'completions', types: true, docs: true, urls: true },
      function(error, data) {
        if (error) return showError(ts, cm, error);
        var completions = [],
          after = '';
        var from = data.start,
          to = data.end;
        if (
          cm.getRange(Pos(from.line, from.ch - 2), from) == '["' &&
          cm.getRange(to, Pos(to.line, to.ch + 2)) != '"]'
        )
          after = '"]';

        for (var i = 0; i < data.completions.length; ++i) {
          var completion = data.completions[i],
            className = typeToIcon(completion.type);
          if (data.guess) className += ' ' + cls + 'guess';
          completions.push({
            text: completion.name + after,
            displayText: completion.displayName || completion.name,
            className: className,
            data: completion,
          });
        }

        var obj = { from: from, to: to, list: completions };
        var tooltip = null;
        CodeMirror.on(obj, 'close', function() {
          remove(tooltip);
        });
        CodeMirror.on(obj, 'update', function() {
          remove(tooltip);
        });
        CodeMirror.on(obj, 'select', function(cur, node) {
          remove(tooltip);
          var content = ts.options.completionTip
            ? ts.options.completionTip(cur.data)
            : cur.data.doc;
          if (content) {
            tooltip = makeTooltip(
              node.parentNode.getBoundingClientRect().right +
                window.pageXOffset,
              node.getBoundingClientRect().top + window.pageYOffset,
              content,
            );
            tooltip.className += ' ' + cls + 'hint-doc';
          }
        });
        c(obj);
      },
    );
  }

  function typeToIcon(type) {
    var suffix;
    if (type == '?') suffix = 'unknown';
    else if (type == 'number' || type == 'string' || type == 'bool')
      suffix = type;
    else if (/^fn\(/.test(type)) suffix = 'fn';
    else if (/^\[/.test(type)) suffix = 'array';
    else suffix = 'object';
    return cls + 'completion ' + cls + 'completion-' + suffix;
  }

  // Type queries

  function showContextInfo(ts, cm, pos, queryName, c) {
    ts.request(
      cm,
      queryName,
      function(error, data) {
        if (error) return showError(ts, cm, error);
        if (ts.options.typeTip) {
          var tip = ts.options.typeTip(data);
        } else {
          var tip = elt(
            'span',
            null,
            elt('strong', null, data.type || 'not found'),
          );
          if (data.doc)
            tip.appendChild(document.createTextNode(' — ' + data.doc));
          if (data.url) {
            tip.appendChild(document.createTextNode(' '));
            var child = tip.appendChild(elt('a', null, '[docs]'));
            child.href = data.url;
            child.target = '_blank';
          }
        }
        tempTooltip(cm, tip, ts);
        if (c) c();
      },
      pos,
    );
  }

  // Maintaining argument hints

  function updateArgHints(ts, cm) {
    closeArgHints(ts);

    if (cm.somethingSelected()) return;
    var state = cm.getTokenAt(cm.getCursor()).state;
    var inner = CodeMirror.innerMode(cm.getMode(), state);
    if (inner.mode.name != 'javascript') return;
    var lex = inner.state.lexical;
    if (lex.info != 'call') return;

    var ch,
      argPos = lex.pos || 0,
      tabSize = cm.getOption('tabSize');
    for (
      var line = cm.getCursor().line, e = Math.max(0, line - 9), found = false;
      line >= e;
      --line
    ) {
      var str = cm.getLine(line),
        extra = 0;
      for (var pos = 0; ; ) {
        var tab = str.indexOf('\t', pos);
        if (tab == -1) break;
        extra += tabSize - ((tab + extra) % tabSize) - 1;
        pos = tab + 1;
      }
      ch = lex.column - extra;
      if (str.charAt(ch) == '(') {
        found = true;
        break;
      }
    }
    if (!found) return;

    var start = Pos(line, ch);
    var cache = ts.cachedArgHints;
    if (cache && cache.doc == cm.getDoc() && cmpPos(start, cache.start) == 0)
      return showArgHints(ts, cm, argPos);

    ts.request(cm, { type: 'type', preferFunction: true, end: start }, function(
      error,
      data,
    ) {
      if (error || !data.type || !/^fn\(/.test(data.type)) return;
      ts.cachedArgHints = {
        start: start,
        type: parseFnType(data.type),
        name: data.exprName || data.name || 'fn',
        guess: data.guess,
        doc: cm.getDoc(),
      };
      showArgHints(ts, cm, argPos);
    });
  }

  function showArgHints(ts, cm, pos) {
    closeArgHints(ts);

    var cache = ts.cachedArgHints,
      tp = cache.type;
    var tip = elt(
      'span',
      cache.guess ? cls + 'fhint-guess' : null,
      elt('span', cls + 'fname', cache.name),
      '(',
    );
    for (var i = 0; i < tp.args.length; ++i) {
      if (i) tip.appendChild(document.createTextNode(', '));
      var arg = tp.args[i];
      tip.appendChild(
        elt(
          'span',
          cls + 'farg' + (i == pos ? ' ' + cls + 'farg-current' : ''),
          arg.name || '?',
        ),
      );
      if (arg.type != '?') {
        tip.appendChild(document.createTextNode(':\u00a0'));
        tip.appendChild(elt('span', cls + 'type', arg.type));
      }
    }
    tip.appendChild(document.createTextNode(tp.rettype ? ') ->\u00a0' : ')'));
    if (tp.rettype) tip.appendChild(elt('span', cls + 'type', tp.rettype));
    var place = cm.cursorCoords(null, 'page');
    var tooltip = (ts.activeArgHints = makeTooltip(
      place.right + 1,
      place.bottom,
      tip,
    ));
    setTimeout(function() {
      tooltip.clear = onEditorActivity(cm, function() {
        if (ts.activeArgHints == tooltip) closeArgHints(ts);
      });
    }, 20);
  }

  function parseFnType(text) {
    var args = [],
      pos = 3;

    function skipMatching(upto) {
      var depth = 0,
        start = pos;
      for (;;) {
        var next = text.charAt(pos);
        if (upto.test(next) && !depth) return text.slice(start, pos);
        if (/[{\[\(]/.test(next)) ++depth;
        else if (/[}\]\)]/.test(next)) --depth;
        ++pos;
      }
    }

    // Parse arguments
    if (text.charAt(pos) != ')')
      for (;;) {
        var name = text.slice(pos).match(/^([^, \(\[\{]+): /);
        if (name) {
          pos += name[0].length;
          name = name[1];
        }
        args.push({ name: name, type: skipMatching(/[\),]/) });
        if (text.charAt(pos) == ')') break;
        pos += 2;
      }

    var rettype = text.slice(pos).match(/^\) -> (.*)$/);

    return { args: args, rettype: rettype && rettype[1] };
  }

  // Moving to the definition of something

  function jumpToDef(ts, cm) {
    function inner(varName) {
      var req = { type: 'definition', variable: varName || null };
      var doc = findDoc(ts, cm.getDoc());
      ts.server.request(buildRequest(ts, doc, req), function(error, data) {
        if (error) return showError(ts, cm, error);
        if (!data.file && data.url) {
          window.open(data.url);
          return;
        }

        if (data.file) {
          var localDoc = ts.docs[data.file],
            found;
          if (localDoc && (found = findContext(localDoc.doc, data))) {
            ts.jumpStack.push({
              file: doc.name,
              start: cm.getCursor('from'),
              end: cm.getCursor('to'),
            });
            moveTo(ts, doc, localDoc, found.start, found.end);
            return;
          }
        }
        showError(ts, cm, 'Could not find a definition.');
      });
    }

    if (!atInterestingExpression(cm))
      dialog(cm, 'Jump to variable', function(name) {
        if (name) inner(name);
      });
    else inner();
  }

  function jumpBack(ts, cm) {
    var pos = ts.jumpStack.pop(),
      doc = pos && ts.docs[pos.file];
    if (!doc) return;
    moveTo(ts, findDoc(ts, cm.getDoc()), doc, pos.start, pos.end);
  }

  function moveTo(ts, curDoc, doc, start, end) {
    doc.doc.setSelection(start, end);
    if (curDoc != doc && ts.options.switchToDoc) {
      closeArgHints(ts);
      ts.options.switchToDoc(doc.name, doc.doc);
    }
  }

  // The {line,ch} representation of positions makes this rather awkward.
  function findContext(doc, data) {
    var before = data.context.slice(0, data.contextOffset).split('\n');
    var startLine = data.start.line - (before.length - 1);
    var start = Pos(
      startLine,
      (before.length == 1 ? data.start.ch : doc.getLine(startLine).length) -
        before[0].length,
    );

    var text = doc.getLine(startLine).slice(start.ch);
    for (
      var cur = startLine + 1;
      cur < doc.lineCount() && text.length < data.context.length;
      ++cur
    )
      text += '\n' + doc.getLine(cur);
    if (text.slice(0, data.context.length) == data.context) return data;

    var cursor = doc.getSearchCursor(data.context, 0, false);
    var nearest,
      nearestDist = Infinity;
    while (cursor.findNext()) {
      var from = cursor.from(),
        dist = Math.abs(from.line - start.line) * 10000;
      if (!dist) dist = Math.abs(from.ch - start.ch);
      if (dist < nearestDist) {
        nearest = from;
        nearestDist = dist;
      }
    }
    if (!nearest) return null;

    if (before.length == 1) nearest.ch += before[0].length;
    else
      nearest = Pos(
        nearest.line + (before.length - 1),
        before[before.length - 1].length,
      );
    if (data.start.line == data.end.line)
      var end = Pos(nearest.line, nearest.ch + (data.end.ch - data.start.ch));
    else
      var end = Pos(
        nearest.line + (data.end.line - data.start.line),
        data.end.ch,
      );
    return { start: nearest, end: end };
  }

  function atInterestingExpression(cm) {
    var pos = cm.getCursor('end'),
      tok = cm.getTokenAt(pos);
    if (tok.start < pos.ch && tok.type == 'comment') return false;
    return /[\w)\]]/.test(
      cm.getLine(pos.line).slice(Math.max(pos.ch - 1, 0), pos.ch + 1),
    );
  }

  // Variable renaming

  function rename(ts, cm) {
    var token = cm.getTokenAt(cm.getCursor());
    if (!/\w/.test(token.string)) return showError(ts, cm, 'Not at a variable');
    dialog(cm, 'New name for ' + token.string, function(newName) {
      ts.request(
        cm,
        { type: 'rename', newName: newName, fullDocs: true },
        function(error, data) {
          if (error) return showError(ts, cm, error);
          applyChanges(ts, data.changes);
        },
      );
    });
  }

  function selectName(ts, cm) {
    var name = findDoc(ts, cm.doc).name;
    ts.request(cm, { type: 'refs' }, function(error, data) {
      if (error) return showError(ts, cm, error);
      var ranges = [],
        cur = 0;
      var curPos = cm.getCursor();
      for (var i = 0; i < data.refs.length; i++) {
        var ref = data.refs[i];
        if (ref.file == name) {
          ranges.push({ anchor: ref.start, head: ref.end });
          if (cmpPos(curPos, ref.start) >= 0 && cmpPos(curPos, ref.end) <= 0)
            cur = ranges.length - 1;
        }
      }
      cm.setSelections(ranges, cur);
    });
  }

  var nextChangeOrig = 0;
  function applyChanges(ts, changes) {
    var perFile = Object.create(null);
    for (var i = 0; i < changes.length; ++i) {
      var ch = changes[i];
      (perFile[ch.file] || (perFile[ch.file] = [])).push(ch);
    }
    for (var file in perFile) {
      var known = ts.docs[file],
        chs = perFile[file];
      if (!known) continue;
      chs.sort(function(a, b) {
        return cmpPos(b.start, a.start);
      });
      var origin = '*rename' + ++nextChangeOrig;
      for (var i = 0; i < chs.length; ++i) {
        var ch = chs[i];
        known.doc.replaceRange(ch.text, ch.start, ch.end, origin);
      }
    }
  }

  // Generic request-building helper

  function buildRequest(ts, doc, query, pos) {
    var files = [],
      offsetLines = 0,
      allowFragments = !query.fullDocs;
    if (!allowFragments) delete query.fullDocs;
    if (typeof query == 'string') query = { type: query };
    query.lineCharPositions = true;
    if (query.end == null) {
      query.end = pos || doc.doc.getCursor('end');
      if (doc.doc.somethingSelected()) query.start = doc.doc.getCursor('start');
    }
    var startPos = query.start || query.end;

    if (doc.changed) {
      if (
        doc.doc.lineCount() > bigDoc &&
        allowFragments !== false &&
        doc.changed.to - doc.changed.from < 100 &&
        doc.changed.from <= startPos.line &&
        doc.changed.to > query.end.line
      ) {
        files.push(getFragmentAround(doc, startPos, query.end));
        query.file = '#0';
        var offsetLines = files[0].offsetLines;
        if (query.start != null)
          query.start = Pos(query.start.line - -offsetLines, query.start.ch);
        query.end = Pos(query.end.line - offsetLines, query.end.ch);
      } else {
        files.push({ type: 'full', name: doc.name, text: docValue(ts, doc) });
        query.file = doc.name;
        doc.changed = null;
      }
    } else {
      query.file = doc.name;
    }
    for (var name in ts.docs) {
      var cur = ts.docs[name];
      if (cur.changed && cur != doc) {
        files.push({ type: 'full', name: cur.name, text: docValue(ts, cur) });
        cur.changed = null;
      }
    }

    return { query: query, files: files };
  }

  function getFragmentAround(data, start, end) {
    var doc = data.doc;
    var minIndent = null,
      minLine = null,
      endLine,
      tabSize = 4;
    for (var p = start.line - 1, min = Math.max(0, p - 50); p >= min; --p) {
      var line = doc.getLine(p),
        fn = line.search(/\bfunction\b/);
      if (fn < 0) continue;
      var indent = CodeMirror.countColumn(line, null, tabSize);
      if (minIndent != null && minIndent <= indent) continue;
      minIndent = indent;
      minLine = p;
    }
    if (minLine == null) minLine = min;
    var max = Math.min(doc.lastLine(), end.line + 20);
    if (
      minIndent == null ||
      minIndent ==
        CodeMirror.countColumn(doc.getLine(start.line), null, tabSize)
    )
      endLine = max;
    else
      for (endLine = end.line + 1; endLine < max; ++endLine) {
        var indent = CodeMirror.countColumn(
          doc.getLine(endLine),
          null,
          tabSize,
        );
        if (indent <= minIndent) break;
      }
    var from = Pos(minLine, 0);

    return {
      type: 'part',
      name: data.name,
      offsetLines: from.line,
      text: doc.getRange(from, Pos(endLine, end.line == endLine ? null : 0)),
    };
  }

  // Generic utilities

  var cmpPos = CodeMirror.cmpPos;

  function elt(tagname, cls /*, ... elts*/) {
    var e = document.createElement(tagname);
    if (cls) e.className = cls;
    for (var i = 2; i < arguments.length; ++i) {
      var elt = arguments[i];
      if (typeof elt == 'string') elt = document.createTextNode(elt);
      e.appendChild(elt);
    }
    return e;
  }

  function dialog(cm, text, f) {
    if (cm.openDialog) cm.openDialog(text + ': <input type=text>', f);
    else f(prompt(text, ''));
  }

  // Tooltips

  function tempTooltip(cm, content, ts) {
    if (cm.state.ternTooltip) remove(cm.state.ternTooltip);
    var where = cm.cursorCoords();
    var tip = (cm.state.ternTooltip = makeTooltip(
      where.right + 1,
      where.bottom,
      content,
    ));
    function maybeClear() {
      old = true;
      if (!mouseOnTip) clear();
    }
    function clear() {
      cm.state.ternTooltip = null;
      if (tip.parentNode) fadeOut(tip);
      clearActivity();
    }
    var mouseOnTip = false,
      old = false;
    CodeMirror.on(tip, 'mousemove', function() {
      mouseOnTip = true;
    });
    CodeMirror.on(tip, 'mouseout', function(e) {
      if (!CodeMirror.contains(tip, e.relatedTarget || e.toElement)) {
        if (old) clear();
        else mouseOnTip = false;
      }
    });
    setTimeout(maybeClear, ts.options.hintDelay ? ts.options.hintDelay : 1700);
    var clearActivity = onEditorActivity(cm, clear);
  }

  function onEditorActivity(cm, f) {
    cm.on('cursorActivity', f);
    cm.on('blur', f);
    cm.on('scroll', f);
    cm.on('setDoc', f);
    return function() {
      cm.off('cursorActivity', f);
      cm.off('blur', f);
      cm.off('scroll', f);
      cm.off('setDoc', f);
    };
  }

  function makeTooltip(x, y, content) {
    var node = elt('div', cls + 'tooltip', content);
    node.style.left = x + 'px';
    node.style.top = y + 'px';
    document.body.appendChild(node);
    return node;
  }

  function remove(node) {
    var p = node && node.parentNode;
    if (p) p.removeChild(node);
  }

  function fadeOut(tooltip) {
    tooltip.style.opacity = '0';
    setTimeout(function() {
      remove(tooltip);
    }, 1100);
  }

  function showError(ts, cm, msg) {
    if (ts.options.showError) ts.options.showError(cm, msg);
    else tempTooltip(cm, String(msg), ts);
  }

  function closeArgHints(ts) {
    if (ts.activeArgHints) {
      if (ts.activeArgHints.clear) ts.activeArgHints.clear();
      remove(ts.activeArgHints);
      ts.activeArgHints = null;
    }
  }

  function docValue(ts, doc) {
    var val = doc.doc.getValue();
    if (ts.options.fileFilter)
      val = ts.options.fileFilter(val, doc.name, doc.doc);
    return val;
  }

  // Worker wrapper

  function WorkerServer(ts) {
    var worker = (ts.worker = new Worker(ts.options.workerScript));
    worker.postMessage({
      type: 'init',
      defs: ts.options.defs,
      plugins: ts.options.plugins,
      scripts: ts.options.workerDeps,
    });
    var msgId = 0,
      pending = {};

    function send(data, c) {
      if (c) {
        data.id = ++msgId;
        pending[msgId] = c;
      }
      worker.postMessage(data);
    }
    worker.onmessage = function(e) {
      var data = e.data;
      if (data.type == 'getFile') {
        getFile(ts, data.name, function(err, text) {
          send({ type: 'getFile', err: String(err), text: text, id: data.id });
        });
      } else if (data.type == 'debug') {
        window.console.log(data.message);
      } else if (data.id && pending[data.id]) {
        pending[data.id](data.err, data.body);
        delete pending[data.id];
      }
    };
    worker.onerror = function(e) {
      for (var id in pending) pending[id](e);
      pending = {};
    };

    this.addFile = function(name, text) {
      send({ type: 'add', name: name, text: text });
    };
    this.delFile = function(name) {
      send({ type: 'del', name: name });
    };
    this.request = function(body, c) {
      send({ type: 'req', body: body }, c);
    };
  }
});
